Telephone-transmitter



w; T. BOOTH. TELEPHONE TRANSMITTER.

APPLICATION FILED FEB. 24; I911.

PatentedSeptJgL1920.

mvenforx "WM/2m Z 500% by A UNITED STATES PATENT OFFICE.

WILLIAM 'r. BOOTH, OFEAS'I' ommeniimlw amen, mem s .ivownsrean ELECTRIC COMPANY, INCORPORATED, or New-YORK, N. Y., n-coeroab TION orv NEW YORK.

, -E I.I }LEPHONE-TRAI\VTISMITTER.

Application filed February 24; 1917. ser al No. 1 50,632

To all whom it may concern East Orange, in the'county' of Essex and State of New Jersey, have invented certain new and useful Improvements in Telephone Transmitters, of which thefo'llowing is a full, clear, concise, andexact description.

Thisinvention relates to telephone transmitters and'the like, and more particularly to a means for sealing the working parts of such apparatus against the entrance of moisture.

The invention provides a unitary structurecomprlsmg a front plate or mouthpiece member on which the working parts of the transmitter, for example, are mounted; The diaphragm anddampmg sprlng construction are preferably of the general type disclosed in the SCI'lbIlBI'l Patent 1,050,304,

dated January 14, 1913, inasmuch as this construction does not require the perforation of the diaphragm at its center, which had been considered necessary in previous constructions, to permit the attachment of the front electrode of the transmitter'button vto the diaphragm;

I The invention further provides a gasket which is clamped between the periphery of the diaphragm and the supporting front I plate or mouthpiece in such a way, as to prethereof. l

ivent the entrance of: moisture from the mouthpiece, under the edge of the .dia

phragmn This gasket: extends beyond the edge of the diaphragmasuificient distance so that when the transmitter unit isaplaced in the; external moistureprooflcasing, the

gasket will also engagethe rim of thecasing and act as a fseal'against the entrance-of moisture at this point.

theinvention as applied to an incasedtransmitte'r,and inwhich Figure 1 is a side view partly] in cross-section of the transmitter, while Fig. 2-; is I a 1 horizontal cross-section The construction'ashown comprises a cy-' lindrical casing 1 of brass or. other 'suitable material, having the bottom ;thefreof closed. The top edge 2 of the casing is smooth and preferably beveled toward. the outer edge.

thereof. runnions' 4 are shown on opposite I V sides of'the casing -1, andserve to facilitate Be it knownvthat I, WILLIAM TVBoo'rH, a. citizen of the United States, residing at pivotal mounting-of the casing if desired, and are secured 'to the casing in such a way eled'bore 8, in whichqistseated a soft rub ber 'wedgeQQ A cap 10 is threadedto the collar 7 and carries a metallic washer 11,

Patented Sept. 14, 1920.

-1 m Waber-t eht. j i h re i h-V Thetrunnionsmay obviously be formed in-' tegral with the casing if desired. Aiwaterwhich prevents abrasion of the rubber on movement of the cap. Tightening-of t he cap'forces the'wedge 9 into firm engagement with the cord'extending through the stuffing box-6,'and thus produces a water-tight joint therewith, y '7 The transmitter mechanism is assembled unit, which greatly facilitates inspection and adjustment of the apparatus.- Thear- I rangement' shown comprises a ring 12 of any suitable material, preferably brass, which carries a transmitter bridge secured to the rearthereof; 'The bridge'carg ries a transmitter button 14 insulated therefrom. The button 14 is held in contact with an imperforate diaphragm 15, by-a central damping spring 16 secured tobut insulated from one'jleg of the bridge 13; This con struction is of the general type disclosed in Scribner'Patent'No, 1,050,304, of January l and placedwithin the casing-1 as a single 14, 1913, and-is peculiarly adapted to the requirements of a water-tight construction I L in that it does-notnecessitate theperfora Other featuresiof the invention will appear from a consideration of-the accompanying drawings,-which show one form of tion of sthe"'diaphragm for the attachment ton 14 "with reference to the diaphragm 1 5 is iaccomp'lished by providing a collar 17 carried by but insulated from the bridge and in which the stem '18 of the'button :14 is'lon itudinally movable.= 'A'qset screw 19 int e collar 17 engages the stem :18 to2}hold it'sadjusted. positional The diaphragm 15 1 is s am as separated? from the ring12 by aJringQO-pI'eferably of The casin has a threaded portion at the top 7 thenc e ontI-overbind-ing post '8 tary'transmitter, structune='-ancl I 7 .i1the-upperedge'2 o f the-casing 1, while flange of the mouthpieceioning material, referabl rubber, engages f the diap ragm and makes 5 of screws 23, and serves, to press the gasket 21 into firm engagement with the diaphragm 15 to hold the diaphragm firmly in position, and to provide a water-tight-joint be? tween the diaphragm and the washerr2l. This joint serves to keep moisture entering the mouthpiece 22 from penetrating to the 'rear of the diaphragm. A suitable drain 0 enin 24: may be rovided in the mouth P e P,

.piece 22to furnish'an outlet for any moisturewhich may collect behind the mouthpiece.

Itis often desirable to have a transmitter cut-out or cut-in button, and provision is made for a cut-1n button in the construction 20 shown. The backof the bridge 13 is pro- "'Vided with a fixed contact piece 25 insulated therefrom, and having a plurality of arms 26 and 27 the arms havingstops to limit the outward movement of contact springs 28 and 29 respectively. The springs 28 and 29 are secured ,to, but insulated from the sides of the bridge 13. The spring 28, while insulated from the bridge 13, is electrically lar manner. The spring 28 is separated from the arm. 26 by insulation 32, while the spring 29 norm-ally makes electricalcontact with the arm 27, as'shown. The ring '12 has a slot'33,.to which; a.pin.34' on thecasing l fits, to position'theunit in proper. relation" p to the push button 5, as shown; the spring-28 engaging with the insulated tip of the push button. The springs 28 and 29 are arranged to make engagement-before contact is broken between the arin27 and spring 29'; while insulation 35 on the contact piece-'25; prevents a. electrical contact between the spring 29 and contact "piece 25 on forcing the push-button into its limit of movement. Contact piece 25 car ries a binding post 36, and the'normal circuit extends in over the. binding post 31, thenoeto spring-29,: to arm 27,..and thence out through binding post -36, leaving the transmitter button 14 sho' rtecircnited; while, 7

on ,pnessing-thepush button 5, the transmit- 'ter button 14 is placed in circuit for transmission, theic-imuitkextendingin over the 28, screws -30, spring 16, transmitter buttonM and stem -18 to collar 17-, and

- electrica-ll-mntaot with the (collar.

looking ring 38 Venga'ging over a peripheral connected with the damping spring 16.

bin ingflpost '31-,thenoe to spring '29, spring whichis in bears upon 22 serves to hold 1 the casing 1. The single washer 21 thus serves to seal against 'moisture' entering either by way of the upper edge of the casing or by way of the mouthpiece and diaphragm, while the assembling of the washer, as a part of the unitary structure, is of considerable advantage; 7

The invention is obviously also suitable for telephone receivers or other devices wherein itis desirable to hold a diaphragm or the like in place, and also to provide a seal between'the diaphragm mounting and a surrounding support or .casing.

What is claimed is: V 1. In-combination, a casing open at one end, diaphragm supporting means, a front plate, adia'phrag'm between saidsupporting means and plate, said diaphragm being smaller than the internal dimensions of the open endof said casing, a gasket of moisture proof cushioning material engaging the periphery of said diaphragm and extending beyond the same into engagement with the"- open end of said casing to prevent moisture entering said casing, and means to secure said front plate to the open end of said casing.

2. A casing for acoustic apparatus com prising a cup, a diaphragm supported within the cup, a coverfor the casing, and a moisture proof gasket providingv moisture proof oints between the cover and cup and 7 between the diaphragm and cup. 7

A casing for acoustic apparatus comprising a cup, a cover therefor, a diaphragm supported within the on having one side thereof substantially fius with the rim of cup and cover and between the diaphragm gasket of inoisturepproof cushioning material engaging the periphery of saiddia-- phragm and the open "end of said casing to prevent moisture' entering said casin and means to secure said front plate tibft' e *"iopen'end ofsaid casin g. The 'a'nnlular gasket-2a is ,part cf t'h'e imithe cup, a gasketof moisture proof cu shi0'n-- lng material between said cover and casing of the open end of isai'd 'casing 5. A'tran'smi'tter casing ceinprising a cup,

; a cover 7 therefor, a diaphragm supported within the cup, at transmitterelement with-. in said casing in enga gemen'twithsaid wphragm, and a'gasket 'oE moisture proof 'moisture proof cushioning material between said cover and cup engaging theperiphery of said diaphragm and the rim of the cup to provide joints between the cup and cover and between the diaphragm and cup.

6. In combination, a casing open at one end, diaphragm supporting means, a front plate, an imperforate diaphragm between said supporting means and front plate, a transmitter element within said casing, means for holding said element in engagement with said diaphragm, a gasket. of moisture proof cushioning material engaging the periphery of said diaphragm and the open end of said casing to prevent moisture entering said casing, and means to secure said front plate to the open end of said casing.

7 The combination with a unitary telephonic element, of a casing therefor open at one end, and means to secure to the open end of said casing; said unitary element comprising a transmission device, supporting means therefor, a diaphragm smaller than the internal dimensions of the open end of said casing to cooperate with said device and carried by said supporting means, and a gasket of moisture proof cushioning material engaging said diaphragm and the open end of said casing to prevent moisture entering said casing.

8. The combination with a unitary telephonic element, of a casing therefor open at one end, and means to secure said element to the open end of said casing; said unitary element comprising a transmission device, supporting means therefor, a diaphragm smaller than the internal dimensions of the open end of said casing to cooperate with said device and carried by said supporting means, a front plate, and a single gasket of moisture proof cushioning matei rial between sald front plate and supporting means, said gasket also engaging the open the open end of said casing,

said element end of said casing to prevent moisture entering said casing.

9. In combination, a casing open at one end, diaphragm supporting means, a mouthpiece, an imperforate diaphragm between said supporting means and mouthpiece, a

transmitter element within said casing, a

spring engaging said transmitter element to hold it in contact engagement with the inner side of said diaphragm, a gasket between said mouthpiece and diaphragm engaging the periphery of said diaphragm and and means to secure said mouthpiece to the open end of said casing.

10; In combination, a casing having a substantially circular opening at one end, a diaphragm smaller than said opening and supported therein, a front plate covering said opening, a single gasket of moisture proof cushioning riphery of said diaphragm and also engag ing said a moisture tight joinfl therebetgeen, and means to secure said front plate to said casing.

a 11. In combination,

materialeirgaging the pe- I casing and front plate to make a casing open at one end, a ring in the open end ofsaid casing, i

a bridge carried thereby, ried on said ring within said casing and substantially flush with the rim thereof, a transmitter button carried by said bridge and engaging said diaphragm, a single gasket'between said ring and'mouthpiece engaging the periphery of said diaphragm and the rim of the open end of said casing,

and means to secure said mouthpiece to the a diaphragm caropen end of said casing and in engagement with said gasket.

In witness whereof, I hereunto subscribe my name this 23rd day of February A. D.',

I WILLIAM 'r. BOOTH... 

